NADP+ is an endogenous PARP inhibitor in DNA damage response and tumor suppression

Chunjing Bian, Chao Zhang, Tao Luo, Aditi Vyas, Shih-Hsun Chen, Chao Liu, Muzaffer Ahmad Kassab, Ying Yang, Mei Kong and Xiaochun Yu ()
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Chunjing Bian: City of Hope Medical Center
Chao Zhang: Capital Medical University
Tao Luo: Capital Medical University
Aditi Vyas: City of Hope Medical Center
Shih-Hsun Chen: City of Hope Medical Center
Chao Liu: City of Hope Medical Center
Muzaffer Ahmad Kassab: City of Hope Medical Center
Ying Yang: City of Hope Medical Center
Mei Kong: City of Hope Medical Center
Xiaochun Yu: City of Hope Medical Center

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract ADP-ribosylation is a unique posttranslational modification catalyzed by poly(ADP-ribose) polymerases (PARPs) using NAD+ as ADP-ribose donor. PARPs play an indispensable role in DNA damage repair and small molecule PARP inhibitors have emerged as potent anticancer drugs. However, to date, PARP inhibitor treatment has been restricted to patients with BRCA1/2 mutation-associated breast and ovarian cancer. One of the major challenges to extend the therapeutic potential of PARP inhibitors to other cancer types is the absence of predictive biomarkers. Here, we show that ovarian cancer cells with higher level of NADP+, an NAD+ derivative, are more sensitive to PARP inhibitors. We demonstrate that NADP+ acts as a negative regulator and suppresses ADP-ribosylation both in vitro and in vivo. NADP+ impairs ADP-ribosylation-dependent DNA damage repair and sensitizes tumor cell to chemically synthesized PARP inhibitors. Taken together, our study identifies NADP+ as an endogenous PARP inhibitor that may have implications in cancer treatment.

Date: 2019
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DOI: 10.1038/s41467-019-08530-5

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